Mechanical movement.



M. D. COMPTON.

MECHANICAL MOVEMENT. APPLICATION FILED APR.16.1913.

Patented Dec. 29, 1914.

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MELVIN D. COMPTON, OF NEW YORK, N. Y.

MECHANICAL MOVEMENT.

Application filed April 16, 1913. Serial No. 761,469.

To all whom it may concern:

Be it known that I, MELVIN D. COMPTON, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented-certain new and useful Improvements in Mechanical Movements, of which 'the following is a specification.

The principal object of the present 1nvention is to provide a mechanical movement for transforming reciprocatory and rotary motions which shall involve in its construction a comparatively small number of parts and which shall be comparatively simple and inexpensive to build,compact and reliable in operation and which shall be useful in connection with so-called selfstarters for internal explosion or combustion engines as well as for other purposes.

The invention will be claimed at the end hereof but will be first described. in connection with the embodiment chosen from among other embodiments of it for illus, tration in the accompanying drawings 1n which Figure 1, is a side view, partly in section and somewhat diagrammatic in character, illustrating a mebhanical movement embodying features of the invention. F1gs. 2-4, inclusive areside views, partly 1n section, illustrating difi'erent positions of the In the drawings, Figs. 14:, 1, is a rotary segmental gear and it isprovided with plunger teeth 2 an'd3. The ends of these plunger. teeth are normally held up beyond the pitch circle as by springs' 1, but the teeth are capable of receding below the pitch l ne radially towardthe center with a sliding motion.- There is a pair of duplicate reciprocating racks 5 and 6, and these are provided with rigid teeth. The rack teeth next to the end teeth operate on the ends'of the plunger teeth and recede them. '9 and'10, are oppositely disposed movable dogs on the racks and these cooperate with a plunger tooth or more accurately'with a projection 11, extending laterally therefrom. These dogs are. pivoted at 12', and are provided with a back stop 13, and with a spring 14:. r

So as to explain the mode of operation, the mechanical movement will be considered in application to a self-starter. although the invention is not limited to that teeth, this being a driven by it.

the tooth 3, to clear the gear 1, so that use, while at the same time that use is a very important one. The racks 5 and 6, are connected with a rod 15, of the piston 16, which is reciprocated as by compressed air. The segmental gear is appropriately connected with the engine shaft or with some part 17 connected with the engine shaft. As shown in Fig. 1, the racks are moving toward the left guided, of course, in suitable parallel fixed ways 18. Under these circumstances the rack 6, is driving the gear 1, in clockwise direction and the rack 5, does not engage any teeth on the gear 1.

Referring to Fig. 2, the rack 5, is doing the driving and is near the end of its stroke. The plunger tooth 3, at the top, is shown as wider than the other teeth and is in engagement with the extreme lefthand space of the rack 5. This space is shown as wider than the other spaces. The plunger tooth 2, shown at the bottom 'in Fig. 2, is on the end of one tooth 7, of the next to the end teeth of the rack which has receded it. For this purpose there is a bevel or cam surface between the ends of the plunger and rack tooth 7. In the present instance-the bevel happens to be shown on rack tooth but it may be transferred to the plunger mere transfer not in volving invention. At the beginning of the lefthand stroke, Fig. 3, the plunger tooth 2, has passed over the tooth 7, and is being The end of the" plunger tooth 3, will be operated upon by the end of the second tooth 8, of the rack which recedes the latter is continuously turned clockwise. In Fig. 3, the dog 9,.is shown as turned to one side away from its back stop 13, by the projection 11, on the plunger tooth 2. Thus the gear is turned in the same direction, being driven first by one rack and then by the other and the plunger teeth permitthis to be accomplished while insuring that at least one tooth on the gear is always in engagement with one tooth on one or the other of the racks, but never are teeth on the gear engaged by teeth on both racks at the same time, as that would tend to lock the device. If by reason of what is known as a kick or flash-back the gear 1,

shouldbe driven in counter-clockwise direction, as indicated in Fig. 4, it would drive the racks causing compression on the piston 16, but when the racks get to the end of the stroke the dog 9, held by its back stop 13, would recede the plunger tooth, as at the bottom of Fig. 4, thus freeing the gear from the rack 6, and letting it operate on the rack 5.

The construction and mode of operation of the modification shown in Fig. 5, are as has been described except that the segmental gear has three groups of teeth instead of one, each group of teeth and each rack being exactly as has been described in connection with Figs. 14. Thus it appears that more than one group of teeth may be employed with the result that the stroke of the racks may be shortened and the movement made compact.

I do not intend to limit the invention to details of construction and arrangement for they may be varied, as is evident to those skilled in the art, but

Having thusdescribed my invention, what I claim as new and desire to secure by' Letters Patent is;

l. A mechanical movement comprising the combination of a rotary segmental gear provided with end plunger teeth, and a pair of reciprocatory racks having at opposite ends the next to the end teeth arranged for receding the plunger teeth, there being abeveled face between said plunger and the next to the end rack teeth, whereby reciprocation of the racks is accompanied with con--,

tinuous rotation of the gear in the same.

direction.

2. A mechanical movement comprising the combination ofa rotary segmental gear ranged on the racks and cooperating with provided with end plunger teeth, a pair of". i

the plunger teeth to recede them when the segmental gear is driven backward.

In testimony whereof I have hereunto signed my name in the presence of.

MELVIN D. COMPTON. Witnesses: J

S. E. PATTERSON, FRANK E. FRENCH. 

